1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qplatformdrag.h"
5
6#include <QtGui/private/qdnd_p.h>
7#include <QtGui/QKeyEvent>
8#include <QtGui/QGuiApplication>
9#include <QtCore/QEventLoop>
10
11QT_BEGIN_NAMESPACE
12
13#ifdef QDND_DEBUG
14# include <QtCore/QDebug>
15#endif
16
17QPlatformDropQtResponse::QPlatformDropQtResponse(bool accepted, Qt::DropAction acceptedAction)
18 : m_accepted(accepted)
19 , m_accepted_action(acceptedAction)
20{
21}
22
23bool QPlatformDropQtResponse::isAccepted() const
24{
25 return m_accepted;
26}
27
28Qt::DropAction QPlatformDropQtResponse::acceptedAction() const
29{
30 return m_accepted_action;
31}
32
33QPlatformDragQtResponse::QPlatformDragQtResponse(bool accepted, Qt::DropAction acceptedAction, QRect answerRect)
34 : QPlatformDropQtResponse(accepted,acceptedAction)
35 , m_answer_rect(answerRect)
36{
37}
38
39QRect QPlatformDragQtResponse::answerRect() const
40{
41 return m_answer_rect;
42}
43
44class QPlatformDragPrivate {
45public:
46 QPlatformDragPrivate() : cursor_drop_action(Qt::IgnoreAction) {}
47
48 Qt::DropAction cursor_drop_action;
49};
50
51/*!
52 \class QPlatformDrag
53 \since 5.0
54 \internal
55 \preliminary
56 \ingroup qpa
57
58 \brief The QPlatformDrag class provides an abstraction for drag.
59 */
60QPlatformDrag::QPlatformDrag() : d_ptr(new QPlatformDragPrivate)
61{
62}
63
64QPlatformDrag::~QPlatformDrag()
65{
66 delete d_ptr;
67}
68
69QDrag *QPlatformDrag::currentDrag() const
70{
71 return QDragManager::self()->object();
72}
73
74Qt::DropAction QPlatformDrag::defaultAction(Qt::DropActions possibleActions,
75 Qt::KeyboardModifiers modifiers) const
76{
77#ifdef QDND_DEBUG
78 qDebug() << "QDragManager::defaultAction(Qt::DropActions possibleActions)\nkeyboard modifiers : " << modifiers;
79#endif
80
81 Qt::DropAction default_action = Qt::IgnoreAction;
82
83 if (currentDrag()) {
84 default_action = currentDrag()->defaultAction();
85 }
86
87
88 if (default_action == Qt::IgnoreAction) {
89 //This means that the drag was initiated by QDrag::start and we need to
90 //preserve the old behavior
91 default_action = Qt::CopyAction;
92 }
93
94 if (modifiers & Qt::ControlModifier && modifiers & Qt::ShiftModifier)
95 default_action = Qt::LinkAction;
96 else if (modifiers & Qt::ControlModifier)
97 default_action = Qt::CopyAction;
98 else if (modifiers & Qt::ShiftModifier)
99 default_action = Qt::MoveAction;
100 else if (modifiers & Qt::AltModifier)
101 default_action = Qt::LinkAction;
102
103#ifdef QDND_DEBUG
104 qDebug() << "possible actions : " << possibleActions;
105#endif
106
107 // Check if the action determined is allowed
108 if (!(possibleActions & default_action)) {
109 if (possibleActions & Qt::CopyAction)
110 default_action = Qt::CopyAction;
111 else if (possibleActions & Qt::MoveAction)
112 default_action = Qt::MoveAction;
113 else if (possibleActions & Qt::LinkAction)
114 default_action = Qt::LinkAction;
115 else
116 default_action = Qt::IgnoreAction;
117 }
118
119#ifdef QDND_DEBUG
120 qDebug() << "default action : " << default_action;
121#endif
122
123 return default_action;
124}
125
126/*!
127 \brief Cancels the currently active drag (only for drags of
128 the current application initiated by QPlatformDrag::drag()).
129
130 The default implementation does nothing.
131
132 \since 5.7
133 */
134
135void QPlatformDrag::cancelDrag()
136{
137 Q_UNIMPLEMENTED();
138}
139
140/*!
141 \brief Called to notify QDrag about changes of the current action.
142 */
143
144void QPlatformDrag::updateAction(Qt::DropAction action)
145{
146 Q_D(QPlatformDrag);
147 if (d->cursor_drop_action != action) {
148 d->cursor_drop_action = action;
149 emit currentDrag()->actionChanged(action);
150 }
151}
152
153static const char *const default_pm[] = {
154"13 9 3 1",
155". c None",
156" c #000000",
157"X c #FFFFFF",
158"X X X X X X X",
159" X X X X X X ",
160"X ......... X",
161" X.........X ",
162"X ......... X",
163" X.........X ",
164"X ......... X",
165" X X X X X X ",
166"X X X X X X X",
167};
168
169Q_GLOBAL_STATIC_WITH_ARGS(QPixmap,qt_drag_default_pixmap,(default_pm))
170
171QPixmap QPlatformDrag::defaultPixmap()
172{
173 return *qt_drag_default_pixmap();
174}
175
176/*!
177 \since 5.4
178 \brief Returns bool indicating whether QPlatformDrag takes ownership
179 and therefore responsibility of deleting the QDrag object passed in
180 from QPlatformDrag::drag. This can be useful on platforms where QDrag
181 object has to be kept around.
182 */
183bool QPlatformDrag::ownsDragObject() const
184{
185 return false;
186}
187
188QT_END_NAMESPACE
189

source code of qtbase/src/gui/kernel/qplatformdrag.cpp